Neither the workboat nor the barge displayed appropriate navigation lights for the towing arrangement, there was no dedicated lookout, and the operator lacked awareness of the appropriate lighting requirements. Personnel on the pleasure craft positioned forward of the windshield hampered the operator's forward visibility, and no effective lookout was posted while the vessel proceeded at 21 knots. Neither vessel made an attempt to communicate with the other using sound signal or very high frequency radio.Findings as to Causes and Contributing Factors Neither the workboat nor the barge displayed appropriate navigation lights for the towing arrangement, there was no dedicated lookout, and the operator lacked awareness of the appropriate lighting requirements. Personnel on the pleasure craft positioned forward of the windshield hampered the operator's forward visibility, and no effective lookout was posted while the vessel proceeded at 21 knots. Neither vessel made an attempt to communicate with the other using sound signal or very high frequency radio. The people sitting on the forward deck of the pleasure craft were at undue risk of falling overboard- be it as the result of a collision (as in this occurrence) or during high-speed turns or sudden stops.Finding as to Risk The people sitting on the forward deck of the pleasure craft were at undue risk of falling overboard- be it as the result of a collision (as in this occurrence) or during high-speed turns or sudden stops. The propane lantern used on the barge had a maximum range of visibility of 0.9to 1.1miles. The workboat operator had no formal training in navigation and was not certificated, nor was this required by regulations.Other Findings The propane lantern used on the barge had a maximum range of visibility of 0.9to 1.1miles. The workboat operator had no formal training in navigation and was not certificated, nor was this required by regulations.